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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Revenues: $ 25,337 $ 23,409 $ 26,106 $ 47,488 $ 47,667 $ 65,690 $ 67,941 $ 51,775 $ 122,340 $ 233,073 $ 212,470
Cost of goods sold 32,999 18,227 11,906 41,089 29,793 38,555 43,068 40,605 104,221 152,021 143,103
Operating expenses 13,294 6,431 5,546 5,865 13,995 12,687 5,668 5,219 31,136 37,569 41,688
Net income $ (2,884) $ 36,282 $ 4,640 $ (84) $ 2,388 $ 10,926 $ 14,276 $ 4,033 $ 37,954 $ 31,623 $ 20,101
Basic (in dollars per share) $ (0.07) $ 0.91 $ 0.12 $ 0 $ 0.06 $ 0.27 $ 0.36 $ 0.10 $ 0.94 $ 0.79 $ 0.50
Diluted (in dollars per share) $ (0.07) $ 0.91 $ 0.12 $ 0 $ 0.05 $ 0.27 $ 0.36 $ 0.10 $ 0.94 $ 0.78 $ 0.50